The thin films are detected by the infrared spectrum instrument, X ray diffractioninstrument and the atom force microscope. The results show that the clearly pronoumced peak at 891cm-1 indicates the Si-N bond of the crystal Si3N4. There are also Si - H and N-H bonds because of the existence of hydrogen as impurity.

By the phase analysis in the XRD patterns it was proved that there were not reactios between YBa_2Cu_3O_(7-δ) and BaPbO_3. When BaPbO_3 was used as impurity in YBa_2Cu_3O_(7-δ) the superconductivity was much better than PbO as impurity in YBa_2Cu_3O_(7-δ).

X射线衍射分析表明YBa_2Cu_3O_(7-δ)与BaPbO_3没有发生反应。

With low carbon content,Co3W9C4 and Co3W3 C exists in the alloy as impurity.

The results show that, using the precursors with molar ratios of Ni/P =1/2 and 1/3, the catalysts yielded contain phase-pure Ni2P on their surfaces, whereas, using the precursors with molar ratio of Ni/P = 1/1, the catalysts yielded contain phase of Ni2P and little amount of Ni12P5 phase as impurity on their surfaces.

The results obtained reveal that the synthesized catalyst is composed of Fe3O4,FeWO4 and WO3The catalyst is porous with the size of its composition phases in the order of micometer,the Fe3O4phase in the catalyst contains W atoms as impurity.

Ten benzene and substituted benzene diazonium fluoroborates were synthesized and obtained in colourless crystalline form. These compounds with Mohr's salt containing small amount of copper ion as impurity were used as redox initiator for the polymerizations of acrylonitrile in aqueous solution. Rates of polymerization initiated by different substituted benzene diazonium fluoroborates were studied. Results show that the rate of polymerization with different substituents could be correlated by the Hammett...

Ten benzene and substituted benzene diazonium fluoroborates were synthesized and obtained in colourless crystalline form. These compounds with Mohr's salt containing small amount of copper ion as impurity were used as redox initiator for the polymerizations of acrylonitrile in aqueous solution. Rates of polymerization initiated by different substituted benzene diazonium fluoroborates were studied. Results show that the rate of polymerization with different substituents could be correlated by the Hammett equation.

This paper deals with the insulated treeing breakdown phenomenon in polyethylene power cables in service. It is shown that the electrical trees which develop in service may originate from impurities present in the insulation. These electrical trees (originating from impurities found in the insulation layer) grow in the direction of the electrical stress. These "impurities" are the antioxidant DNP. All these DNP, if not properly dispersed and thoroughly compatible, may act as "impurities"...

This paper deals with the insulated treeing breakdown phenomenon in polyethylene power cables in service. It is shown that the electrical trees which develop in service may originate from impurities present in the insulation. These electrical trees (originating from impurities found in the insulation layer) grow in the direction of the electrical stress. These "impurities" are the antioxidant DNP. All these DNP, if not properly dispersed and thoroughly compatible, may act as "impurities" and thus lead to gap formation and subsequent electrical treeing.

This paper relates to the catalytic effect of iron on chlorination of MgO in process of preraration of anhydrous MgCl_2 in molten salt medium.The problems of retarding the effect of iron as impurity on electrolytic process of MgCl_2 by addition of asurface inactive substance,purifying the molten salt, etc.are also discussed.